diff --git a/src/pages/GrowTentKonfigurator.js b/src/pages/GrowTentKonfigurator.js
index 9c41c1f..cf153d6 100644
--- a/src/pages/GrowTentKonfigurator.js
+++ b/src/pages/GrowTentKonfigurator.js
@@ -92,8 +92,7 @@ class GrowTentKonfigurator extends Component {
     this.handleExtraToggle = this.handleExtraToggle.bind(this);
     this.calculateTotalPrice = this.calculateTotalPrice.bind(this);
     this.saveStateToWindow = this.saveStateToWindow.bind(this);
-
-
+    this.checkCacheValidity = this.checkCacheValidity.bind(this);
   }
 
   saveStateToWindow() {
@@ -116,6 +115,7 @@ class GrowTentKonfigurator extends Component {
     this.fetchCategoryData("Lampen");
     this.fetchCategoryData("Abluft-sets");
     this.fetchCategoryData("Set-zubehoer");
+    this.cacheCheckInterval = setInterval(this.checkCacheValidity, 60000);
   }
 
   componentDidUpdate(prevProps, prevState) {
@@ -156,12 +156,25 @@ class GrowTentKonfigurator extends Component {
     }
   }
 
+  componentWillUnmount() {
+    if (this.cacheCheckInterval) {
+      clearInterval(this.cacheCheckInterval);
+    }
+  }
   fetchCategoryData(categoryId) {
     const cachedData = getCachedCategoryData(categoryId);
     if (cachedData) {
+      this.setState(prevState => ({
+        categoryLoadStatus: {
+          ...prevState.categoryLoadStatus,
+          [categoryId]: true
+        }
+      }));
       return;
     }
 
+    console.log(`Cache miss for category ${categoryId}, fetching...`);
+
     window.socketManager.off(`productList:${categoryId}`);
 
     window.socketManager.on(`productList:${categoryId}`,(response) => {
@@ -182,6 +195,23 @@ class GrowTentKonfigurator extends Component {
     );
   }
 
+  checkCacheValidity() {
+    const categories = ["Zelte", "Lampen", "Abluft-sets", "Set-zubehoer"];
+    let needsUpdate = false;
+    const newStatus = { ...this.state.categoryLoadStatus };
+    for (const categoryId of categories) {
+      if (newStatus[categoryId] && !getCachedCategoryData(categoryId)) {
+        console.log(`Refetching ${categoryId} due to cache miss/expiry`);
+        newStatus[categoryId] = false;
+        needsUpdate = true;
+        this.fetchCategoryData(categoryId);
+      }
+    }
+    if (needsUpdate) {
+      this.setState({ categoryLoadStatus: newStatus });
+    }
+  }
+
   handleTentShapeSelect(shapeId) {
     this.setState({ selectedTentShape: shapeId });
   }
@@ -600,22 +630,20 @@ class GrowTentKonfigurator extends Component {
       return null; // Don't show tent sizes until shape is selected
     }
 
+    if (!this.state.categoryLoadStatus["Zelte"]) {
+      return (
+        <Box sx={{ textAlign: 'center', py: 4 }}>
+          <Typography variant="h6" color="text.secondary">
+            Lade Growbox-Produkte...
+          </Typography>
+        </Box>
+      );
+    }
+
     // Get real filtered tent products for the selected shape
     const filteredTents = this.getTentsForShape(selectedTentShape);
 
-    // Show loading state if data is not yet available
     if (filteredTents.length === 0) {
-      const cachedData = getCachedCategoryData('Zelte');
-      if (!cachedData) {
-        return (
-          <Box sx={{ textAlign: 'center', py: 4 }}>
-            <Typography variant="h6" color="text.secondary">
-              Lade Growbox-Produkte...
-            </Typography>
-          </Box>
-        );
-      }
-      // If we have cached data but no filtered tents, show empty state
       return (
         <Box sx={{ textAlign: 'center', py: 4 }}>
           <Typography variant="h6" color="text.secondary">
@@ -624,18 +652,6 @@ class GrowTentKonfigurator extends Component {
         </Box>
       );
     }
-
-
-    if (filteredTents.length === 0) {
-      return (
-        <Box sx={{ textAlign: 'center', py: 4 }}>
-          <Typography variant="h6" color="text.secondary">
-            Keine Produkte verfügbar
-          </Typography>
-        </Box>
-      );
-    }
-
     return (
       <Box sx={{ mb: 4 }}>
         <Typography variant="h2" component="h2" gutterBottom sx={{ color: '#2e7d32', fontWeight: 'bold' }}>
@@ -743,11 +759,7 @@ class GrowTentKonfigurator extends Component {
       );
     }
 
-    // Get real lamps for selected tent shape
-    const availableLamps = this.getLampsForTentShape(selectedTentShape);
-    const cachedData = getCachedCategoryData('Lampen');
-
-    if (!cachedData) {
+    if (!this.state.categoryLoadStatus["Lampen"]) {
       return (
         <Box sx={{ mt: 4 }}>
           <Typography variant="h2" component="h2" gutterBottom sx={{ color: '#2e7d32', fontWeight: 'bold' }}>
@@ -760,6 +772,8 @@ class GrowTentKonfigurator extends Component {
       );
     }
 
+    const availableLamps = this.getLampsForTentShape(selectedTentShape);
+
     if (availableLamps.length === 0) {
       return (
         <Box sx={{ mt: 4 }}>
@@ -772,7 +786,7 @@ class GrowTentKonfigurator extends Component {
         </Box>
       );
     }
-
+ 
     return (
       <Box sx={{ mt: 4 }}>
         <Typography variant="h2" component="h2" gutterBottom sx={{ color: '#2e7d32', fontWeight: 'bold' }}>
@@ -872,11 +886,7 @@ class GrowTentKonfigurator extends Component {
       );
     }
 
-    // Get real ventilation products for selected tent shape
-    const availableVentilation = this.getVentilationForTentShape(selectedTentShape);
-    const cachedData = getCachedCategoryData('Abluft-sets');
-
-    if (!cachedData) {
+    if (!this.state.categoryLoadStatus["Abluft-sets"]) {
       return (
         <Box sx={{ mt: 4 }}>
           <Typography variant="h2" component="h2" gutterBottom sx={{ color: '#2e7d32', fontWeight: 'bold' }}>
@@ -889,6 +899,8 @@ class GrowTentKonfigurator extends Component {
       );
     }
 
+    const availableVentilation = this.getVentilationForTentShape(selectedTentShape);
+
     if (availableVentilation.length === 0) {
       return (
         <Box sx={{ mt: 4 }}>
@@ -901,7 +913,7 @@ class GrowTentKonfigurator extends Component {
         </Box>
       );
     }
-
+ 
     return (
       <Box sx={{ mt: 4 }}>
         <Typography variant="h2" component="h2" gutterBottom sx={{ color: '#2e7d32', fontWeight: 'bold' }}>
@@ -1025,6 +1037,19 @@ class GrowTentKonfigurator extends Component {
 
   renderExtrasSection() {
     const { selectedExtras } = this.state;
+    if (!this.state.categoryLoadStatus["Set-zubehoer"]) {
+      return (
+        <Box sx={{ mb: 4 }}>
+          <Typography variant="h2" component="h2" gutterBottom sx={{ color: '#2e7d32', fontWeight: 'bold' }}>
+            5. Extras hinzufügen (optional)
+          </Typography>
+          <Typography variant="body1" color="text.secondary" sx={{ mb: 3 }}>
+            Lade Extras...
+          </Typography>
+        </Box>
+      );
+    }
+
     const extrasData = getCachedCategoryData('Set-zubehoer');
 
     if (!extrasData) {
@@ -1034,7 +1059,7 @@ class GrowTentKonfigurator extends Component {
             5. Extras hinzufügen (optional)
           </Typography>
           <Typography variant="body1" color="text.secondary" sx={{ mb: 3 }}>
-            Lade Extras...
+            Keine Extras verfügbar
           </Typography>
         </Box>
       );
@@ -1225,14 +1250,6 @@ class GrowTentKonfigurator extends Component {
 
 
   render() {
-    // Check if all 4 category data sections have loaded
-    const tentsData = getCachedCategoryData('Zelte');
-    const lampsData = getCachedCategoryData('Lampen');
-    const ventilationData = getCachedCategoryData('Abluft-sets');
-    const extrasData = getCachedCategoryData('Set-zubehoer');
-
-    const allDataLoaded = tentsData && lampsData && ventilationData && extrasData;
-
     return (
       <Container maxWidth="lg" sx={{ py: 4 }}>
         <Paper elevation={2} sx={{ p: 4, borderRadius: 2 }}>
@@ -1297,27 +1314,19 @@ class GrowTentKonfigurator extends Component {
 
           {this.renderTentShapeSection()}
           <Divider sx={{ my: 4 }} />
-          
-          {allDataLoaded && (
-            <>
-
-
               {this.renderTentSizeSection()}
               {this.state.selectedTentShape && <Divider sx={{ my: 4 }} />}
-
+ 
               {this.renderLightSection()}
               <Divider sx={{ my: 4 }} />
-
+ 
               {this.renderVentilationSection()}
               <Divider sx={{ my: 4 }} />
-
+ 
               {this.renderExtrasSection()}
-
+ 
               {/* Inline summary section - expands when scrolling to bottom */}
               {this.renderInlineSummary()}
-            </>
-          )}
-
         </Paper>
       </Container>
     );